Battery I left my lights on for about 3-5 hours last night and I wanted to jump start my car but I couldn't find the battery. I drive a 2006 Chevy Cobalt Sedan. Help!

All systems should reset after disconnecting and reconnecting a good charged battery. However, before going any further you should remove the dead battery, have it checked and either replace it or charge it out of the vehicle. Then, install it and see if that works. If not, you probably will have to replace the BCM. Jump starting a dead battery is a very bad idea unless it is done very carefully, and even then, it can cause damage to modules.

Your Main Battery is Flat, get a jump start if its safe or remove the battery and hook it up to a charger. Maybe you left your lights on, or your alternator isnt charging the battery properly when your driving around. Sometimes this can be the bushes located in the alternator.

Get a good battery and make sure you have nice squeaky clean cable connections.

Maintenance-free batteries really don't tolerate complete discharge very well. If the battery was already several years old, letting it go dead probably was the last straw, so now it may not hold a charge more than a day or two, or it may have so little capacity that if you start the car a couple of times without a long (20 min+) drive between starts to recharge the battery, it won't be able to start the car the next time without a jump. Probably time to go battery shopping.
You didn't mention your model, but many BMWs use unusual battery sizes (group #s). Most of us use a smaller, common size battery, or a larger (longer) battery because original sized batteries are hard to find at the retailers, and when you find one, it may not be very fresh. If your battery will only last six or seven years at best, you don't want to buy one that is already a year old, and has been sitting on the shelf partially charged for that year.

not a battery problem if you could still drive it with lights off,but you do have a loose connection some where,can't tell you why your battery went dead 2 nights ago

you may need some power steering fluid or it could be a computer fault. the clicking was a low battery not being able to turn the starter motor but it should not effect your steerin. try some fluid first if that doesn't work take it to a garage. it could be something simple like a loose wire.

u can try to put key in drivers door lock & un lock it manually some times this will work

have you checked the earth points,if you are using jump leads and its starting sounds like its using there earth

Look in trunk, under floor cover.